Narrow-frame backlight module and oblique insertion type manufacturing process thereof

Abstract

This application relates to the field of backlight module technology, specifically disclosing a narrow-bezel backlight module and its oblique insertion manufacturing process. The module includes a housing with mounting holes on its edges; a light source assembly for emitting lateral light; a light guide plate with one end face facing the light source assembly; positioning protrusions on the edge of the light guide plate for insertion into the mounting holes; a diaphragm assembly including at least one layer of optical film, which is stacked on the light-emitting side or backlight side of the light guide plate; and an adhesive component located within the receiving cavity at the edge away from the positioning protrusions. This application, by employing a fixing method combining positioning protrusions and multi-layer adhesive components, replaces the traditional plastic or metal frame, simplifying the module structure, eliminating the cost of the frame mold, and effectively reducing the manufacturing cost of the backlight module.

Description

Technical Field

[0001] This application relates to the field of backlight module technology, and in particular to a narrow bezel backlight module and its oblique insertion manufacturing process. Background Technology

[0002] Traditional backlight modules rely heavily on a mid-frame for fixation during production and assembly. This is because a backlight module is composed of multiple layers of components: typically, reflective films, light guide plates, LED strips, and various optical films are layered within a housing. These materials and films are initially loosely packed together and are prone to bulging and deformation when exposed to high temperatures or moisture. To secure them firmly, the industry practice is to attach a rigid plastic mid-frame around the perimeter of the finished product. This mid-frame presses down from top to bottom, clamping and holding the light guide plate and edge films in place. This plastic side frame also serves to block edge light leaking from the LEDs.

[0003] However, the presence of the mid-frame forces manufacturers to outsource the development of injection molds, and they also face maintenance costs for mold modification and repair, which further increases the manufacturing cost of the backlight module. Summary of the Invention

[0004] To reduce the manufacturing cost of backlight modules, this application provides a narrow bezel backlight module and its oblique insertion manufacturing process.

[0005] In a first aspect, this application provides a narrow bezel backlight module, which adopts the following technical solution: A narrow bezel backlight module includes a housing with a receiving cavity, the edge of which has several mounting holes; a light source assembly disposed in the receiving cavity and near the side edge of the receiving cavity, for emitting lateral light; a light guide plate disposed in the receiving cavity, one side end face of the light guide plate facing the light source assembly, for introducing the lateral light emitted by the light source assembly and emitting the light in a direction generally perpendicular to the surface of the light guide plate; the edge of the light guide plate has a positioning protrusion for inserting into the mounting holes to limit the displacement of the light guide plate relative to the housing; a diaphragm assembly including at least one layer of optical film, the optical film being stacked on the light-emitting side or the backlight side of the light guide plate; and an adhesive member disposed in the receiving cavity at the edge away from the positioning protrusion; when the bottom wall of the housing, the edge of the light guide plate, and the edge of the optical film are stacked sequentially, the stacked contact surfaces of adjacent layers are connected by the adhesive member.

[0006] By adopting the above technical solution, during assembly, precise positioning on one side can be achieved simply by inserting the positioning protrusion of the light guide plate into the mounting hole on the outer shell; simultaneously, the layers of the structure on the other side are naturally pressed together and fixed by adhesive components. This method eliminates the reliance on traditional plastic or metal frames, achieving stable assembly using the module's own components. This not only simplifies the structure and avoids the development and maintenance costs of frame molds, but also improves assembly efficiency, thereby effectively reducing the overall manufacturing cost of the backlight module.

[0007] Optionally, the diaphragm assembly includes a reflective sheet, a diffuser sheet, and a brightness enhancement sheet. The reflective sheet is disposed between the light guide plate and the bottom wall of the housing. The diffuser sheet is disposed on the side of the light guide plate away from the reflective sheet, and the brightness enhancement sheet is disposed on the side of the diffuser sheet away from the light guide plate.

[0008] By adopting the above technical solution, the light emitted by the light source component enters from the side of the light guide plate and is emitted uniformly from the front, ensuring the basic optical performance of the backlight module and providing a clear stacking object for subsequent assembly processes.

[0009] Optionally, the light guide plate includes a plate body and a light-shielding strip connected to the remaining edge of the plate body on the side away from the light source assembly. The light-shielding strip is integrally formed with the plate body, and the positioning protrusion is formed on the light-shielding strip.

[0010] By adopting the above technical solution, the light-shielding strip blocks the edges on the non-light-incident side, effectively preventing light leakage and scattering from these edges. This reduces the light leakage effect caused by eliminating the middle frame, improving the efficiency of light energy utilization and the brightness uniformity of the display surface. The integrated molding structure of the light-shielding strip and the main body of the panel eliminates the assembly process of traditional separate light-shielding components, which not only enhances the overall structural strength and consistency of the light guide plate, but also reduces the number of parts and potential assembly errors.

[0011] Optionally, a reflective strip is provided on the side of the light-shielding strip closest to the main body of the plate.

[0012] By adopting the above technical solution, a reflective strip is added to the inside of the light-shielding strip, which can reflect light that may escape from the edge of the light guide plate back into the light guide plate, reduce light energy loss, and improve the utilization efficiency of the light source. Thus, while achieving the light-shielding function, the overall light effect of the module is optimized.

[0013] Optionally, the light source assembly includes a light strip connected to the light guide plate, with the light-emitting side of the light strip facing the light guide plate; the reflector includes a central sheet and multiple edge sheets, the edge sheets being connected to the edge of the central sheet, the central sheet abutting against the light guide plate and the bottom wall of the housing respectively, the edge sheets on the side away from the light strip being used to cover and adhere to the surface of the edge of the brightening sheet, and the edge sheets on the side closer to the light strip being used to sequentially cover and adhere to the backlight side of the light strip and the surface of the edge of the brightening sheet; the ends of the edge sheets are bonded and fixed to the surface of the brightening sheet.

[0014] By adopting the above technical solution, the edge sheet on the side away from the light strip directly covers the edge of the brightness enhancement film, while the edge sheet on the side closer to the light strip cleverly wraps the backlight side of the light strip together with the edge of the brightness enhancement film, forming a side shield. Therefore, the central sheet undertakes the bottom reflection function, while the edge sheets act as a side wrapping layer to block side light, further reducing light leakage and simplifying the module structure.

[0015] Optionally, the edge sheet is provided with a light-absorbing coating on one side of the light guide plate and the edge of the light enhancement sheet to absorb the lateral light overflowing from the edge of the light guide plate.

[0016] By adopting the above technical solution, a light-absorbing coating is set on the inner side of the edge sheet of the reflective sheet. The light-absorbing coating can effectively absorb stray light reaching the edge and prevent light from forming secondary reflection or diffusion on the surface of the edge sheet, thereby eliminating glare or light leakage in the edge area and ensuring the purity and uniformity of the light-emitting surface.

[0017] Optionally, the edge sheet is provided with clearance holes for the positioning protrusion to pass through.

[0018] By adopting the above technical solution, avoidance holes are opened on the edge sheet of the reflective sheet, allowing the positioning protrusion to pass through smoothly and avoiding structural interference between the reflective sheet and the positioning protrusion when it is folded and wrapped. This ensures that the positioning and wrapping functions can be realized simultaneously and smoothly, ensuring the compatibility of the overall structure.

[0019] Optionally, the edge of the light guide plate is provided with positioning posts, and the optical film on the light-emitting side of the light guide plate is provided with positioning grooves for the positioning posts to pass through.

[0020] By adopting the above technical solution, the positioning posts and positioning grooves cooperate during the stacking and assembly of optical film materials to prevent lateral misalignment between the layers of optical film materials, ensuring the neatness and stability of the optical film material stacking, and further improving the precision and reliability of the module's internal structure.

[0021] Secondly, this application provides a slanted insertion manufacturing process, which adopts the following technical solution: A slanted insertion manufacturing process for fabricating the aforementioned narrow bezel backlight module includes the following steps: Step S1: Install the light strip onto the light guide plate; Step S2: Adhere the light guide plate to the surface of the reflective sheet; Step S3: Attach the diffuser to the light-emitting side of the light guide plate, and attach the brightness enhancement film to the side of the diffuser away from the light guide plate; Step S4: Move the light guide plate to the top of the receiving cavity in an inclined position, move the light guide plate to the side closer to the receiving cavity, and then move the light guide plate to the side closer to the mounting hole, so that the positioning protrusion on the edge of the light guide plate is inserted into the mounting hole on the housing; Step S5: Lay the light guide plate flat so that the reflective sheet is parallel and attached to the bottom wall of the outer shell, and the reflective sheet is bonded and fixed to the bottom wall of the outer shell.

[0022] By adopting the above technical solution, the process first completes the pre-bonding assembly of the light strip, light guide plate, and various optical film layers on the outside to form an assembly. Then, using a slanted insertion method, the assembly is tilted first, guiding the positioning protrusion to be precisely inserted into the mounting holes on the outer shell, completing the positioning on one side. Finally, the assembly is laid flat, and the other side is fixed to the bottom of the outer shell using pre-placed adhesive parts. This method simplifies the complex multi-layer alignment assembly into a single slanted insertion action, improving assembly efficiency, reducing the assembly difficulty and errors caused by multiple alignments, and is suitable for the aforementioned module structure that does not require a middle frame.

[0023] Optionally, before step S1, step S0 is also included: using injection molding process to integrally form the light-shielding strip with the positioning protrusion, and integrally forming the plate body on one side of the light-shielding strip to form the light guide plate; After step S3 and before step S4, steps S31 and S32 are also included: Step S31: Fold each edge sheet extending from the periphery of the reflective sheet upward against the side wall of the light guide plate, keeping the surface of the edge sheet with the light-absorbing coating facing the side closer to the light guide plate; Step S32: On the side away from the light strip, fold the edge sheet upward and then inward so that the edge sheet adheres to and covers the edge surface of the brightness enhancement film on that side, and then bond and fix the edge sheet to the edge of the brightness enhancement film. On the side near the light strip, the edge sheet is folded upwards and then inwards, so that the edge sheet successively adheres to and covers the backlight side of the light strip and the edge surface of the brightness enhancement film on that side, and the edge sheet is bonded and fixed to the edge of the brightness enhancement film.

[0024] By adopting the above technical solution, step S0 clarifies the integrated manufacturing source of the key components of the light guide plate, making the light guide plate easy to manufacture and eliminating the need for separate assembly of the light-shielding strip. Steps S31 and S32 describe in detail the wrapping process of the edge sheet of the reflector. After the optical film is laminated, the edge sheet is folded upwards and then specifically folded inwards to wrap the sides of the module and the light strip. This process ensures that the pre-assembled assembly has complete lateral encapsulation before oblique insertion. Finally, after oblique insertion into the housing, a finished module with complete internal and external structure is formed without the need for an additional mid-frame. The entire process flow is coherent and efficient, and each step closely corresponds to and realizes the various functions of the module structure design.

[0025] In summary, this application includes the following beneficial technical effects: 1. By adopting a fixing method that combines positioning protrusions with multi-layer adhesive components, the traditional plastic or metal mid-frame is replaced, simplifying the module structure, eliminating the cost of mid-frame molds, and effectively reducing the manufacturing cost of the backlight module.

[0026] 2. The reflective sheet is designed with a central sheet and multiple foldable edge sheets, which have both bottom reflection and side wrapping functions. Combined with a light-absorbing coating, it simplifies the structure while improving light-shielding and optical performance.

[0027] 3. The oblique insertion manufacturing process is highly compatible with the module structure. Through external pre-assembly, oblique insertion positioning, and one-time pressing and fixing, the assembly efficiency and accuracy are improved, making the mass production of frameless modules possible. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of a narrow bezel backlight module according to Embodiment 1 of this application; Figure 2 This is a cross-sectional view of a narrow bezel backlight module according to Embodiment 1 of this application; Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle; Figure 4 yes Figure 2 A magnified view of a portion of point B in the middle; Figure 5 This is a schematic diagram of the structure of a narrow bezel backlight module according to Embodiment 2 of this application, after hiding the outer shell and the diaphragm assembly; Figure 6This is a cross-sectional view of a narrow bezel backlight module according to Embodiment 2 of this application; Figure 7 yes Figure 6 A magnified view of a portion of point C in the middle; Figure 8 yes Figure 6 A magnified view of a portion of point D in the middle; Figure 9 This is a schematic diagram of the overall structure of a narrow bezel backlight module according to Embodiment 2 of this application; Figure 10 This is a schematic diagram of the structure of a narrow bezel backlight module after the outer shell is hidden, according to Embodiment 2 of this application.

[0029] Reference numerals: 1. Outer shell; 11. Mounting hole; 2. Light source assembly; 21. Lamp strip; 3. Light guide plate; 31. Main body of the plate; 311. Positioning post; 32. Light-shielding strip; 321. Positioning protrusion; 322. Reflective strip; 4. Diaphragm assembly; 41. Reflective sheet; 411. Center sheet; 412. Edge sheet; 4121. Clearance hole; 42. Diffuser sheet; 43. Brightness enhancement sheet; 5. Positioning groove; 6. Light-shielding sheet. Detailed Implementation

[0030] The following combination Figures 1-10 This application will be described in further detail.

[0031] Example 1: This application discloses a narrow bezel backlight module. (Refer to...) Figure 1 , Figure 2 and Figure 3 The narrow bezel backlight module includes a housing 1, a light source assembly 2, a light guide plate 3, a diaphragm assembly 4, and an adhesive component (not shown in the figure). The housing 1 serves as the supporting frame for the backlight module, and an internal cavity is formed to accommodate other components. Multiple through-holes 11 are provided at the edge of the side of the housing 1. The light source assembly 2 is disposed within the cavity and located at the edge of the cavity away from the mounting holes 11. The light source assembly 2 includes a light strip 21, which is directly connected to the side end face of the light guide plate 3, with the light-emitting surface of the light strip 21 facing the light guide plate 3; the light source assembly 2 is used to emit light to the side of the light guide plate 3. The light guide plate 3 is disposed within the cavity, with one side end face facing the light source assembly 2, used to receive the lateral light emitted by the light source assembly 2 and guide the light so that it is emitted from the front, approximately perpendicular to the surface direction of the light guide plate 3. The edge of the light guide plate 3 is provided with a plurality of positioning protrusions 321, which are used to be inserted into the mounting holes 11 on the edge of the housing 1, thereby limiting the displacement of the light guide plate 3 within the housing 1.

[0032] Reference Figure 4The diaphragm assembly 4 includes at least one layer of optical film. These optical films are stacked on the light-emitting side or the back-light side of the light guide plate 3 for processing light such as diffusion and brightness enhancement. In this embodiment, the diaphragm assembly 4 includes a reflective sheet 41, a diffuser sheet 42, and a brightness enhancement sheet 43. The reflective sheet 41 is disposed between the light guide plate 3 and the bottom wall of the housing 1, i.e., on the back-light side of the light guide plate 3, and is used to reflect light from the back of the light guide plate 3 back. The diffuser sheet 42 is disposed on the side of the light guide plate 3 away from the reflective sheet 41, i.e., on the light-emitting side of the light guide plate 3; the brightness enhancement sheet 43 is disposed on the side of the diffuser sheet 42 away from the light guide plate 3; two brightness enhancement sheets 43 are disposed and stacked.

[0033] During operation, the light emitted from the light source assembly 2 enters the light guide plate 3 from the side, and is converted into a surface light source that exits from the front. The emitted light first passes through the diffuser plate 42, which further diffuses the light evenly, eliminating any dot marks or uneven brightness that may be caused by the light guide plate 3. Subsequently, the light passes through the brightness enhancement plate 43, which focuses the light and improves the brightness and viewing angle performance of the front-emitted light.

[0034] The adhesive is double-sided tape, more preferably light-shielding double-sided tape. The adhesive is disposed within the receiving cavity and located in the edge area away from the positioning protrusion 321. Multiple adhesives are provided, namely, adhesives are provided between the bottom wall of the housing 1 and the reflective sheet 41, between the reflective sheet 41 and the light guide plate 3, between the light guide plate 3 and the diffuser sheet 42, between the diffuser sheet 42 and the brightness enhancement sheet 43, and between two adjacent brightness enhancement sheets 43. Therefore, when the edges of each layer of optical film are stacked sequentially, they can be bonded and fixed between the contact surfaces of every two adjacent layers by the adhesive, thereby improving the stability of the film assembly 4 after installation.

[0035] Furthermore, a light-shielding sheet 6 is attached to the edge of the brightening sheet 43 on the side away from the diffuser sheet 42 to reduce light leakage at this location.

[0036] The implementation principle of a narrow bezel backlight module in Embodiment 1 is as follows: The light source assembly 2 is activated, emitting lateral light. The light enters from the side end face of the light guide plate 3, is conducted and diffused inside the light guide plate 3, and finally transforms into uniform surface light, which is emitted from the front of the light guide plate 3. The emitted light passes through the optical films stacked on the light-emitting side of the light guide plate 3 in sequence, and undergoes further diffusion, light collection, and other processing according to the function of the film materials to form a beam that meets the display requirements. In the entire module, one side of the light guide plate 3 is connected by the insertion and engagement between the positioning protrusion 321 and the mounting hole 11, while the other side of the light guide plate 3 is tightly bonded to each layer of the structure by multi-layer adhesives, forming a stable overall structural unit.

[0037] This embodiment also discloses a slanted insertion manufacturing process for preparing the above-mentioned narrow bezel backlight module, including the following steps: Step S1: Install the light strip 21 on the side end face of the light guide plate 3.

[0038] Step S2: The back of the light guide plate 3 is glued and fixed to the surface of the reflective sheet 41 using adhesive.

[0039] Step S3: Attach the diffuser 42 to the front side of the light guide plate 3, and then attach the brightness enhancement film 43 to the surface of the diffuser 42.

[0040] Step S4: Move the light guide plate 3, which has been bonded to each optical film, to the upper part of the receiving cavity of the housing 1 in an inclined position. First, move the assembly downwards. When the positioning protrusion 321 on the light guide plate 3 is at the same height as the mounting hole 11 on the housing, move the assembly horizontally so that the positioning protrusion 321 is inserted into the mounting hole 11.

[0041] Step S5: Lay the light guide plate 3 flat so that the bottom reflective sheet 41 is parallel and attached to the bottom wall of the outer shell 1. At this time, the reflective sheet 41 and the bottom wall of the outer shell 1 are fixedly connected by adhesive.

[0042] Example 2: Refer to Figure 5 The difference between this embodiment and Embodiment 1 is that in this embodiment, the light guide plate 3 includes a plate body 31 and light-shielding strips 32 connected to other edges of the plate body 31 away from the light source assembly 2. The light-shielding strips 32 and the plate body 31 are integrally formed by injection molding, and the positioning protrusions 321 are directly formed on the side of the light-shielding strips 32 away from the plate body 31. The plate body 31 undertakes the main light guiding function, responsible for receiving lateral light and converting it into uniform surface light; the light-shielding strips 32 connected to the edge of the plate body 31 are used to shield the edge area of ​​the plate body 31, preventing light from directly overflowing from other edges on the non-light-incident side, reducing light energy loss and side light leakage, thereby improving the light leakage effect caused by the removal of the middle frame.

[0043] Reference Figure 6 and 7 In order to further improve the light effect, a reflective strip 322 is also fixedly installed on the side of the light-shielding strip 32 near the main body 31 of the plate. The reflective strip 322 can reflect the light that may escape from the edge of the light guide plate 3 back into the light guide plate 3, reducing light energy loss.

[0044] Reference Figure 7 , Figure 8 and Figure 9The reflector 41 includes a central sheet 411 and four edge sheets 412 connected around the central sheet 411. The central sheet 411 is laid flat and abuts against the back of the light guide plate 3 and the bottom wall of the housing 1. The edge sheets 412 on the side away from the light strip 21 are folded upwards, then folded inwards and adhered to the edge surface of the brightness enhancement film 43 on that side. The edge sheets 412 on the side closer to the light strip 21 are folded upwards, then folded inwards and sequentially adhered to the backlight side surface of the light strip 21 and the edge surface of the brightness enhancement film 43 on that side. The folded edge sheets 412 form an optical seal on that side, which can shield the side of the light guide plate 3 and the top edge of the brightness enhancement film 43, thereby better blocking light and effectively replacing the role of the traditional middle frame on the side. It is one of the key links in realizing the frameless module structure.

[0045] In this process, after the edge sheet 412 is folded upwards and extends to the surface of the brightness enhancement film 43, the edge sheet 412 and the brightness enhancement film 43 are bonded and fixed together using light-shielding double-sided adhesive. The purpose of this bonding and fixing is twofold: First, it effectively overcomes the stress rebound generated after the edge sheet 412 is folded, ensuring that the edge sheet 412 can be consistently and firmly pressed against the surface of the brightness enhancement film 43 without lifting; second, the sealing effect of the adhesive layer completely eliminates the tiny gaps between the edge sheet 412 and the brightness enhancement film 43, preventing the risk of lateral light leakage; in addition, the bonded edge not only has a stable structure, but its flat upper surface can also be directly used as a bearing surface for subsequent bonding of external components such as LCD panels.

[0046] Furthermore, the edge sheet 412 is coated with a light-absorbing coating on the side of the light guide plate 3 and the edge of the light enhancement sheet 43. The light-absorbing coating can effectively absorb the stray light reaching the edge and prevent the light from forming secondary reflections or diffusion on the surface of the edge sheet 412, thereby eliminating glare or light leakage in the edge area and ensuring the purity and uniformity of the light-emitting surface.

[0047] Reference Figure 7 To ensure the smooth wrapping of the reflector sheet 41, the edge sheet 412 is provided with clearance holes 4121. The number of clearance holes 4121 is the same as the number of positioning protrusions 321. Each clearance hole 4121 corresponds to a positioning protrusion 321. The clearance holes 4121 allow the corresponding positioning protrusions 321 to pass through, so that the edge sheet 412 can smoothly adhere to the side wall of the light guide plate 3 during the upward folding process, avoiding bulging.

[0048] Reference Figure 5 and Figure 10The edge of the main body 31 of the plate away from the positioning protrusion 321 is also integrally formed with a positioning post 311. On all the optical films (i.e., diffuser 42 and brightness enhancement film 43) located on the light-emitting side of the light guide plate 3, there are corresponding positioning grooves 5. When the optical films are stacked, the positioning post 311 passes into these positioning grooves 5 to prevent the optical films from sliding laterally.

[0049] The implementation principle of a narrow bezel backlight module in Embodiment 2 is as follows: First, a light guide plate 3 with a light-shielding strip 32 and a positioning protrusion 321 is manufactured using an integrated molding process, and the lamp strip 21 is installed on the edge of the light guide plate 3 away from the positioning protrusion 321. The reflective sheet 41 is laid flat, with its central sheet 411 bonded to the back of the light guide plate 3, and the edge sheets 412 reserved. Next, the diffuser sheet 42 and the brightness enhancement sheet 43 are sequentially stacked and bonded to the front of the light guide plate 3, and the positioning posts 311 of the light guide plate 3 are inserted into the positioning grooves 5 on each optical film to prevent misalignment. Then, each edge sheet 412 is pressed tightly against the corresponding side wall of the light guide plate 3 and folded upwards, with the light-absorbing coating facing inwards; for the side away from the light strip 21, the folded edge sheet 412 is directly folded inwards and pressed against the top edge of the light enhancement film 43; for the side close to the light strip 21, the folded edge sheet 412 is folded inwards so that it first covers the back side of the light strip 21 and then is pressed against the top edge of the light enhancement film 43.

[0050] Next, the light guide plate 3, to which the reflector sheet 41 and the diaphragm assembly 4 are bonded, is moved into the housing 1 in an inclined position, so that the positioning protrusion 321 is inserted into the mounting hole 11 on the housing 1 for positioning. Then, the light guide plate 3 is flattened and the final fixation to the housing 1 is completed by using the adhesive at the bottom.

[0051] This embodiment also discloses a slanted insertion manufacturing process for preparing the above-mentioned narrow bezel backlight module, including the following steps: Step S0: Using injection molding, a light-shielding strip 32 with positioning protrusions 321 is integrally molded, and a plate body 31 is integrally molded on one side of the light-shielding strip 32 to form a light guide plate 3.

[0052] Step S1: Install the light strip 21 onto the light guide plate 3.

[0053] Step S2: The light guide plate 3 is bonded to the surface of the reflective sheet 41 using an adhesive.

[0054] Step S3: Attach the diffuser 42 to the light-emitting side of the light guide plate 3, and attach the brightness enhancement film 43 to the side of the diffuser 42 away from the light guide plate 3.

[0055] Step S31: Fold the edge sheets 412 extending from the periphery of the reflective sheet 41 upwards against the side wall of the light guide plate 3, keeping the surface of the edge sheet 412 with the light-absorbing coating facing the side closer to the light guide plate 3.

[0056] Step S32: On the side away from the light strip 21, fold the edge sheet 412 upward and then inward so that the edge sheet 412 adheres to and covers the edge surface of the light enhancement film 43 on that side, and use light-shielding double-sided adhesive to bond and fix the end of the edge sheet 412 to the edge of the light enhancement film 43.

[0057] On the side near the light strip 21, the edge sheet 412 is folded upward and then folded inward, so that the edge sheet 412 is successively attached to and covers the backlight side of the light strip 21 and the edge surface of the brightness enhancement film 43 on that side, and the end of the edge sheet 412 is bonded and fixed to the edge of the brightness enhancement film 43 by using light-shielding double-sided adhesive.

[0058] Step S4: Move the light guide plate 3 to the upper part of the receiving cavity of the housing 1 in an inclined position. After moving the light guide plate 3 to the side closer to the receiving cavity, move the light guide plate 3 to the side closer to the mounting hole 11, so that the positioning protrusion 321 on the edge of the light guide plate 3 is inserted into the mounting hole 11 on the housing 1.

[0059] Step S5: Lay the light guide plate 3 flat so that the reflective sheet 41 is parallel and attached to the bottom wall of the outer shell 1, and the reflective sheet 41 is bonded and fixed to the bottom wall of the outer shell 1.

[0060] The above are optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A narrow bezel backlight module, characterized in that, include: The outer shell (1) has a receiving cavity, and the edge of the outer shell (1) is provided with a plurality of mounting holes (11). A light source assembly (2) is disposed in the receiving cavity and near the side edge of the receiving cavity, for emitting lateral light; A light guide plate (3) is disposed in the receiving cavity. One end face of the light guide plate (3) faces the light source assembly (2) and is used to introduce the lateral light emitted by the light source assembly (2) and make the light emit in a direction that is generally perpendicular to the plate surface of the light guide plate (3). The edge of the light guide plate (3) is provided with a positioning protrusion (321). The positioning protrusion (321) is used to be inserted into the mounting hole (11) to limit the displacement of the light guide plate (3) relative to the outer shell (1). The diaphragm assembly (4) includes at least one optical film material, which is stacked on the light-emitting side or the backlight side of the light guide plate (3); An adhesive is provided at the edge of the cavity away from the positioning protrusion (321); when the bottom wall of the outer shell (1), the edge of the light guide plate (3) and the edge of the optical film are stacked in sequence, the stacked contact surfaces of adjacent layers are connected by the adhesive.

2. The narrow bezel backlight module according to claim 1, characterized in that: The diaphragm assembly (4) includes a reflective sheet (41), a diffuser sheet (42), and a brightness enhancement sheet (43). The reflective sheet (41) is disposed between the light guide plate (3) and the bottom wall of the housing (1). The diffuser sheet (42) is disposed on the side of the light guide plate (3) away from the reflective sheet (41), and the brightness enhancement sheet (43) is disposed on the side of the diffuser sheet (42) away from the light guide plate (3).

3. A narrow bezel backlight module according to claim 2, characterized in that: The light guide plate (3) includes a plate body (31) and a light-shielding strip (32) connected to the remaining edge of the plate body (31) away from the light source assembly (2). The light-shielding strip (32) is integrally formed with the plate body (31), and the positioning protrusion (321) is formed on the light-shielding strip (32).

4. A narrow bezel backlight module according to claim 3, characterized in that: The light-shielding strip (32) has a reflective strip (322) on the side near the main body of the plate (31).

5. A narrow bezel backlight module according to claim 3, characterized in that: The light source assembly (2) includes a light strip (21), which is connected to the light guide plate (3), with the light-emitting side of the light strip (21) facing the light guide plate (3); the reflector (41) includes a central sheet (411) and multiple edge sheets (412), with the edge sheets (412) connected to the edge of the central sheet (411), the central sheet (411) abutting against the bottom wall of the light guide plate (3) and the outer shell (1), the edge sheets (412) on the side away from the light strip (21) are used to cover and adhere to the surface of the edge of the brightness enhancement sheet (43), and the edge sheets (412) on the side close to the light strip (21) are used to cover and adhere to the backlight side of the light strip (21) and the surface of the edge of the brightness enhancement sheet (43) in sequence; the end of the edge sheet (412) is bonded and fixed to the surface of the brightness enhancement sheet (43).

6. A narrow bezel backlight module according to claim 5, characterized in that: The edge sheet (412) is used to attach to the side of the light guide plate (3) and the edge of the light enhancement sheet (43) with a light-absorbing coating to absorb the lateral light overflowing from the edge of the light guide plate (3).

7. A narrow bezel backlight module according to claim 5, characterized in that: The edge sheet (412) is provided with a clearance hole (4121) for the positioning protrusion (321) to pass through.

8. A narrow bezel backlight module according to claim 1, characterized in that: The edge of the light guide plate (3) is provided with positioning posts (311), and the optical film on the light-emitting side of the light guide plate (3) is provided with positioning grooves (5) for the positioning posts (311) to pass through.

9. A slanted insertion manufacturing process, characterized in that: For manufacturing the narrow bezel backlight module as described in claim 6, the oblique insertion manufacturing process includes the following steps: Step S1: Install the light strip (21) onto the light guide plate (3); Step S2: Adhere the light guide plate (3) to the surface of the reflective sheet (41); Step S3: Attach the diffuser (42) to the light-emitting side of the light guide plate (3), and attach the brightness enhancement film (43) to the side of the diffuser (42) away from the light guide plate (3); Step S4: Move the light guide plate (3) to the top of the receiving cavity in an inclined position, move the light guide plate (3) to the side closer to the receiving cavity, and then move the light guide plate (3) to the side closer to the mounting hole (11), so that the positioning protrusion (321) on the edge of the light guide plate (3) is inserted into the mounting hole (11) on the outer shell (1); Step S5: Lay the light guide plate (3) flat so that the reflective sheet (41) is parallel to the bottom wall of the outer shell (1) and the reflective sheet (41) is bonded and fixed to the bottom wall of the outer shell (1).

10. The oblique insertion manufacturing process according to claim 9, characterized in that: Before step S1, step S0 is also included: using injection molding process, the light-shielding strip (32) with the positioning protrusion (321) is integrally molded, and the main body of the plate (31) is integrally molded on one side of the light-shielding strip (32) to form the light guide plate (3). After step S3 and before step S4, steps S31 and S32 are also included: Step S31: Fold the edge sheets (412) extending from the periphery of the reflective sheet (41) upward against the side wall of the light guide plate (3), and keep the surface of the edge sheet (412) with the light-absorbing coating facing the side closer to the light guide plate (3); Step S32: On the side away from the light strip (21), fold the edge sheet (412) upward and then inward so that the edge sheet (412) fits and covers the edge surface of the brightness enhancement film (43) on that side, and then bond and fix the edge sheet (412) to the edge of the brightness enhancement film (43). On the side near the light strip (21), the edge sheet (412) is folded upward and then folded inward, so that the edge sheet (412) sequentially adheres to and covers the backlight side of the light strip (21) and the edge surface of the brightness enhancement film (43) on that side, and the edge sheet (412) is bonded and fixed to the edge of the brightness enhancement film (43).

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